A fossil in South Africa is evidence that therapsids, one of our ancestors, were laying eggs 252 million years ago. You can’t make a mammal-ette without laying some eggs. The duck-billed platypus wasn’t the only mammal to lay eggs. Analysis of a fossil in South Africa proves that our mammalian ancestors were cranking out hard-shelled embryos as early as 250 millio... [3136 chars]
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